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  • Users: CESSNA1
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  1. CESSNA1

    ROAD COURSE PROFILES

    HELLO ALL: Vehicle road testing can be done over predefined road profiles. The Perryman Profiles are often used. I am trying to find the definition of the Perryman Profiles. Does anyone have the profiles for the Perryman 1,2,3,4 road courses? I have searched the internet and have been...
  2. CESSNA1

    MOMENT DESTRIBUTION METHOD FOR SIMPLE FRAME

    HELLO ALL: It has been over 30 years since I have worked witn the moment distribution . I am really rusty. By the way this is not a homework problem this is a real world problem. Here is the problem I am trying to solve. A simple 2 dimensional frame with 8" legs and an 11 inch top cross...
  3. CESSNA1

    IMPACT DEFORMATION

    HELLO ALL: Here is my question: A bus (40000#) hits a auto (4000#) in the rear end at a low speed (10 mph) The strucural supports for the bike rack on the bus are deformed plastically. Is there a way to calculate/estimate the force on each of the two brackets? Cordially Dave
  4. CESSNA1

    SCREW FAILURE

    HELLO ALL: Attached are two images of a 10-32 zinc plated steel screw that failed under a sidewise load. The load was applied under the head and the screw broke at the top of the threads in a rivnut. The part that bothers me is the hole in the middle of the screw that is seen in the endview...
  5. CESSNA1

    HINGED PLATE IN FREE FALL

    HELLO ALL: This is a real problem. A uniform rectangular flat steel plate hinged on one side is held at an angle, theta (90<theta>0). The only force acting is earth's gravity. The plate is suddenly released and allowed to fall under th influence of gravity to the horizontal position. ignore...
  6. CESSNA1

    CRACK DETECTION

    HELLO ALL: I am familiar with dye penetrant and magnetic particle crack detection, but I am asking for input/references on other, newer methods such as ultrasonic acoustic emission. I am interested in equipment availabie, ease of use, ease of interpretation, relative costs, and the tough one...
  7. CESSNA1

    MILES RULE

    HELLO EVERYONE: I am trying to find information on "Miles rule". Apparantly it is used in vibration work. Can anyone recommend a good book or article? Thanks to all Regards Dave
  8. CESSNA1

    DECIMATING DIGITAL DATA

    HELLO EVERYONE: What are the advantages and disadvantages of decimating digital data. Say we take data at 100 hz and decimate it by ten to 10 hertz. What problems can be expected of solved? One that comes to mind is aliasing. If decimation effectively moves the sample rate below the filter...
  9. CESSNA1

    HAIL DAMAGE

    HELLO ALL: I have seen several light airplanes (Cessnas, pipers, etc) with hail dimples. I have HEARD that the hail dimples can be removed by palcing dry ice over the dimple. Is this true? If not is their a method other than reskinning? Regards Dave
  10. CESSNA1

    carbon monoxide

    Hello everyone: Would/could someone please reply with the ANSI Z21.10 criteria for the CO and NOX specifications for a 30,000 btu/hr input residential hot water heater. I only need this information and do not want to pay $656.00 for the entire spec. Regards Dave
  11. CESSNA1

    ONE THIRD OCTAVE STUFF

    HELLO: I am analyzing some accelerometer vibration data and have to put it in a one-third octave format. My question has to do with noise reduction. In a normal analysis the noise can be reduced in the frequency domain by successively averaging the data blocks of the PSD. My software(DaDisp)...
  12. CESSNA1

    RULE OF THUMB FOR A/C

    HELLO ALL: IS THERE A RULE OF THUMB FOR AIR CONDITIONING SIZE IN THE NORTHERN SAN DIEGO AREA OF CALIFORNIA. I HAVE COME ACROSS 500 SQ FT PER TON. WHICH MEANS THAT AN 1800 SQ FT HOUSE WOULD NEED ABOUT 3.6 TONS OF A/C. I BELIEVE THAT IS TOO MUCH. THE BUILDER SIZED THE PIPING FOR 3 TONS. I...
  13. CESSNA1

    COPPER PIPE EROSION CORROSION

    HELLO: Does anyone know of a research pare/test report/magazine artilce/ or something else that relates to the erosion corrosion rate of potable water flowing inside a damaged residential under slab copper pipe. i am trying to estimate (guess) the time required for the erosion corrosion. to...

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